Analysis of male meiosis in seven species of indian pill millipedes diplopoda myriapoda

Achar, K.P.

Caryologia 39(1): 89-102


ISSN/ISBN: 0008-7114
DOI: 10.1080/00087114.1986.10797770
Accession: 004740609

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A sequential study of male meiosis of seven species of Indian pill-millipedes (Sphaerotheriidae-Diplopoda), namely, Arthrosphaera davisoni, A. lutescens, A. disticta, A. magna, A. nitida, A. dalyi and Arthrosphaera sp. was carried out using the air drying technique. Meiotic and mitotic tissues were pretreated with colchicine (0.05%), hypotonic Na citrate (0.016 M) and KCl to secure well spread mitotic and meiotic chromosomes, which, otherwise were found to be cytologically difficult to obtain. The sex chromosomes of pill-millipedes still maintain an initial stage of differentiation and the pairing of configurations of chromosomes in male meiosis are only explainable by an XX/XY type of chromosomal sex-determination.